LIGGGHTS® - User Forum

Dear All,

I want to study the rheology of granular particles flowing on a inclined plane. Here, i want to apply periodic boundary condition (PBC) along length and width of the inclined plane. When i applied PBC for this system, it is taking the PBC for the simulation box (cube) not for the inclined plane. Can someone please help me how can i apply PBC on a inclined plane?

Many Thanks,

Narendra

Hi,

Iam trying to fill a container with particles. How can I fill the container upto a specific height.

Hi!
I'm doing a simulation of a cone crusher in LIGGGHTS of 480000 steps, the problem is that halfway through my pc rebooted unexpectedly. I want to ask if there is a way of restart the simulation, from let's say, step 100000 without having to start all over again. I would aprecciate any help

Kind Regards

Hi, All

I'm a new user of LIGGGHTS, and am now here seeking for some help.
I am currently coding a simulation for compression triaxial tests.
I understand that using 'fix particledistribution/discrete', we are able to insert particles according to specific fraction of diameters.
However, I wonder if there is any approaches to present the whole particle size distribution curve for various particle diameters in a simulation?

Thank you.

Best Regards,
Renge

Hi all,
I am new in LIGGGHTS. Would you please guide me?

1- Can I install LIGGGHTS on windows? how?

2- Is it free?

3- Should I write my own code? or there are some pre-set code?

4- I want to study and see the movement of non spherical particles (needle shape) in pipeline containing fluid would you please guide me? can LIGGGHTS be helpful?

Regards,

Taher

Hi all,

I am running a simple case with 2 particles bouncing in a closed box.
At certain time, I can see there is a gap between particles and the wall but still it detects as a contact which seems to be wrong. (visualization in paraview )

I am writing the history of contact-area in the dump files called "localwall.contact" . You might be able to view this file when you run it.
In my case, it happens at 9579, 28851,48123 time-steps and so on i.e it happens for every 19272 time-steps after the first wrong detection.

Dear users,
I'm using LIGGGHTS to perform SPH simulations, and I would like to start the simulation with:

boundary f f p #periodic boundary in z direction

run it for couple of steps, and after that change the boundaries to:

boundary f f f # all fixed boundaries

and run it.

I tried with:

.
.
.
run 1e5
change_box all boundary f f f remap units box
run 1e5

but it does not work. In the output file I get a message:

.
.
.
Changing box ...
Setting up run ...

Hi, all

Are there any commands in LIGGGHTS that is similar to the "local damping" in PFC?
I want to use this command because the simulation is a quasi-static problem. By adopting local damping, the simulation could be greatly sped up without losing accuracy.

Many thanks,

Liu

Hello everybody,

I'm working on a very simple test-case (see input file below). Two particles, one on the top of the other with a normal spring between them (pair_style gran model/hooke/stifness) are compacted in one direction (fix comp all deform 1 z trate -1).

In the dump file, I get the expected positions and forces (components z and fz), but the velocity in the z direction (vz) is 0 for both particles at all time steps.

What am I doing wrong?

Thanks for your help.

Robin